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INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Investments, Unrealized Loss Position [Line Items] |  |
Amortized Cost | $ 83,070 | $ 84,021
Debt Securities, Held-to-maturity, Fair Value | 75,762 | 76,485
Debt Securities, Available-for-sale, Amortized Cost | 3,763,658 | 3,827,418
Investment securities available-for-sale, at fair value (amortized cost $3,763,658 at March 31, 2023 and $3,827,418 at December 31, 2022) | 3,384,949 | 3,409,648
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 509,211 | 1,502,821
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 3,422
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,689,102 | 1,785,690
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 361,464 | 329,398
Debt Securities, Available-for-Sale, Unrealized Loss Position | 3,198,313 | 3,288,511
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 380,988 | 418,604
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 0 | 36,215
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 69,282 | 37,399
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 7,480 | 4,219
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 69,282 | 73,614
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | 7,480 | 7,641
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 19,524 | 89,206
U.S. Treasuries |  |
Investments, Unrealized Loss Position [Line Items] |  |
Amortized Cost | 0 | 0
Debt Securities, Held-to-maturity, Fair Value | 0 | 0
Debt Securities, Available-for-sale, Amortized Cost | 37,319 | 37,312
Investment securities available-for-sale, at fair value (amortized cost $3,763,658 at March 31, 2023 and $3,827,418 at December 31, 2022) | 33,421 | 32,696
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 2,397 | 2,383
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 31,024 | 30,313
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3,864 | 4,570
Debt Securities, Available-for-Sale, Unrealized Loss Position | 33,421 | 32,696
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 3,898 | 4,616
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | 0 | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 34 | 46
Securities of U.S. government agencies and corporations |  |
Investments, Unrealized Loss Position [Line Items] |  |
Amortized Cost | 0 | 0
Debt Securities, Held-to-maturity, Fair Value | 0 | 0
Debt Securities, Available-for-sale, Amortized Cost | 80,728 | 80,382
Investment securities available-for-sale, at fair value (amortized cost $3,763,658 at March 31, 2023 and $3,827,418 at December 31, 2022) | 67,765 | 66,468
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 67,765 | 66,468
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 12,963 | 13,914
Debt Securities, Available-for-Sale, Unrealized Loss Position | 67,765 | 66,468
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 12,963 | 13,914
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | 0 | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Residential Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Amortized Cost | 0 | 0
Debt Securities, Held-to-maturity, Fair Value | 0 | 0
Debt Securities, Available-for-sale, Amortized Cost | 734,761 | 747,478
Investment securities available-for-sale, at fair value (amortized cost $3,763,658 at March 31, 2023 and $3,827,418 at December 31, 2022) | 649,243 | 650,063
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 119,487 | 195,972
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 490,241 | 443,415
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 82,144 | 87,049
Debt Securities, Available-for-Sale, Unrealized Loss Position | 609,728 | 639,387
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 86,142 | 97,462
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | 0 | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3,998 | 10,413
Commercial Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Amortized Cost | 34,659 | 35,363
Debt Securities, Held-to-maturity, Fair Value | 30,678 | 31,249
Debt Securities, Available-for-sale, Amortized Cost | 669,015 | 676,934
Investment securities available-for-sale, at fair value (amortized cost $3,763,658 at March 31, 2023 and $3,827,418 at December 31, 2022) | 624,894 | 629,562
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 84,064 | 440,207
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 2,197
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 540,830 | 175,530
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 41,334 | 28,551
Debt Securities, Available-for-Sale, Unrealized Loss Position | 624,894 | 615,737
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 44,121 | 47,374
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 0 | 17,656
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 30,678 | 13,593
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3,981 | 1,917
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 30,678 | 31,249
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | 3,981 | 4,114
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,787 | 18,823
Collateralized Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Amortized Cost | 9,030 | 9,280
Debt Securities, Held-to-maturity, Fair Value | 8,346 | 8,453
Debt Securities, Available-for-sale, Amortized Cost | 524,394 | 538,970
Investment securities available-for-sale, at fair value (amortized cost $3,763,658 at March 31, 2023 and $3,827,418 at December 31, 2022) | 465,115 | 477,712
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 89,481 | 199,138
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 606
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 366,249 | 269,242
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 55,916 | 48,986
Debt Securities, Available-for-Sale, Unrealized Loss Position | 455,730 | 468,380
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 59,400 | 61,439
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 0 | 6,317
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 8,346 | 2,136
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 684 | 221
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 8,346 | 8,453
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | 684 | 827
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3,484 | 12,453
Obligations of state and other political subdivisions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Amortized Cost | 8,131 | 8,128
Debt Securities, Held-to-maturity, Fair Value | 8,117 | 8,032
Debt Securities, Available-for-sale, Amortized Cost | 828,948 | 832,066
Investment securities available-for-sale, at fair value (amortized cost $3,763,658 at March 31, 2023 and $3,827,418 at December 31, 2022) | 719,175 | 708,463
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 65,220 | 295,913
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 201
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 537,923 | 368,673
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 107,187 | 92,972
Debt Securities, Available-for-Sale, Unrealized Loss Position | 603,143 | 664,586
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 111,128 | 124,168
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 0 | 5,160
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 1,637 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 186 | 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 1,637 | 5,160
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | 186 | 201
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3,941 | 31,196
Asset-backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Amortized Cost | 0 | 0
Debt Securities, Held-to-maturity, Fair Value | 0 | 0
Debt Securities, Available-for-sale, Amortized Cost | 746,463 | 772,261
Investment securities available-for-sale, at fair value (amortized cost $3,763,658 at March 31, 2023 and $3,827,418 at December 31, 2022) | 695,075 | 711,325
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 100,004 | 250,946
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 573,501 | 422,090
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 48,729 | 51,565
Debt Securities, Available-for-Sale, Unrealized Loss Position | 673,505 | 673,036
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 51,567 | 60,975
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | 0 | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,838 | 9,410
Other securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Amortized Cost | 31,250 | 31,250
Debt Securities, Held-to-maturity, Fair Value | 28,621 | 28,751
Debt Securities, Available-for-sale, Amortized Cost | 142,030 | 142,015
Investment securities available-for-sale, at fair value (amortized cost $3,763,658 at March 31, 2023 and $3,827,418 at December 31, 2022) | 130,261 | 133,359
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 48,558 | 118,262
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 418
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 81,569 | 9,959
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 9,327 | 1,791
Debt Securities, Available-for-Sale, Unrealized Loss Position | 130,127 | 128,221
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 11,769 | 8,656
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 0 | 7,082
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 28,621 | 21,670
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,629 | 2,081
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 28,621 | 28,752
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | 2,629 | 2,499
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 2,442 | $ 6,865

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